The Bug
When leaving and joining a world when a wolf is sitting in a boat the wolf would appear sitting.
Reproduce
Tame a wolf
Sit the wolf down
Push a boat into the wolf
Log out and rejoin
Linked issues
relates to 3
Attachments
Comments 3

Applies to cats as well.
Can confirm the behavior in 23w51b, though when checking the wolf's NBT 'sitting' is actually still set to true. It isn't only only a visual issue, but rather the wolf is actually still sitting down in the boat, which technically makes the model more correct than wrong. The issue seems more to be that the wolf isn't properly set to be standing when made to ride something (If entities are intended to only stand in boats).
After re-entering the world:
[media]Also relates to MC-206505